مهندسین جوان مکانیک

Many problems which arise in engineering defy exact analysis. It is often not even necessary to obtain rigorously accurate results to practical engineering problems, since data, variables and factors are themselves usually only approximations.
In design, as one proceeds from a brief to the manufacturing details, one needs to start with approximate assessment of forces, stresses, speeds, power etc., so as to be able to lay out principal geometries. The iterative process leading to a final design usually involves a gradual enhancement of the accuracy of calculated predictions. The value of mathematical precision is often reduced, and even negated, because one invariably has to use idealized simplifications and models to represent real physical situations. Thus approximate methods of calculations with a reasonable knowledge of the degree of accuracy involved can, in general, be much more valuable than complex and time-consuming precise and rigorous mathematical analyses. The expression "degree of accuracy" implies, per se, the need to assess the magnitude and direction of the error invoved.
This book has been written with this underlying philosophy. It is hoped that the information collated, the techniques and methods elucidated, and the case studies described will be of help to engineering designers in their various and demanding tasks.

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